Auto-staining cartridge



FIG. 1 is a top perspective view of an auto-staining cartridge;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is an end view thereof;

FIG. 4 is top view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is another end view thereof;

FIG. 8 is another end view thereof;

FIG. 9 is an expanded top perspective view thereof with the top flipped open and interior parts expanded to show the configuration of each component; the broken lines are included to show the order of assembly and form no part of the claimed design; and,

FIG. 10 is an exploded bottom perspective view thereof showing the underside of the auto-staining cartridge opened and the interior parts expanded to show the configuration of each component; the broken lines are included to show the order of assembly and form no part of the claimed design. 

CLAIM The ornamental design for an auto-staining cartridge, as shown and described. 